Microwave Communication
The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

S = λR/RL
S = λR/L
S = 3λR/L
S = 2λR/L

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Microwave Communication
The cavity resonator

Is equivalent to an LC resonant circuit
In a reflect klystron has its output taken from the reflector plate
Produces a frequency which is independent of the cavity size.
Has a low Q factor for narrow operation.

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